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  • 1
    Electronic Resource
    Electronic Resource
    An Investigation of Structural Stability and Internal Rotation in 3-Cyclopropenecarboxaldehyde and 3-Cyclopropenecarboxylic Acid Fluoride by ab initio Calculations (1998)
    Springer
    Journal of molecular modeling 4 (1998), S. 158-164 
    Details
    ISSN: 0948-5023
    Keywords: Ab initio ; Structural stability ; Rotational barrier ; 3-Cyclopropenecarboxaldehyde ; 3-Cyclo-propenecarboxylic acid fluoride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The structural stability and internal rotation in 3-cyclopropenecarboxaldehyde and 3-cyclo-propenecarboxylic acid fluoride were investigated by ab initio calculations with a 6-31G* atomic basis in the latter and a 6-311G* atomic basis set in the former case. For the sake of comparison also results obtained with a 3-21G basis are given in the paper. As expected, it turned out that this basis set is not large enough for three-membered rings. The calculations were carried out both at the Restricted Hartree-Fock (HF) and the second order Moller-Plesset (MP2) levels. The trans-form is predicted to be the lower energy conformer for both molecules. However, in case of the fluoride the two conformers have nearly the same energy. Full optimization was performed at the transition states and the asymmetric potential function for the CXO internal rotations was predicted for both molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0089480040158
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  • 2
    Electronic Resource
    Electronic Resource
    Citrus replant problem in Iraq III. Interactive effect of soil fungi and allelopathy (1989)
    Springer
    Plant and soil 116 (1989), S. 161-166 
    Details
    ISSN: 1573-5036
    Keywords: allelopathy ; citrus replant problem ; fungal leachate ; pathogenic and non-pathogenic fungi ; sour orange extracts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The interactive effects of citrus root residues and soil fungi on citrus replant problems were investigated. The results indicated that incorporation of citrus root residues in combination with the pathogenic fungiPhytophthora citrophthora, Pythium aphanidermatum andFusarium solani in soil caused more reduction to sour orange growth than did the root residues alone. Subsequent experiments showed that extracts of different parts of sour orange and leachates of some soil fungi increased the disease index of citrus roots grownin vitro. The citrus extracts did not affect growth of the test fungi. Thus, it appears that allelopathic compounds of plant and microbial origins build up in old citrus soil and may act as predisposal agents for the infection of citrus roots by soil pathogens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02214543
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  • 3
    Electronic Resource
    Electronic Resource
    Citrus replant problem in Iraq II. Possible role of allelopathy (1989)
    Springer
    Plant and soil 116 (1989), S. 157-160 
    Details
    ISSN: 1573-5036
    Keywords: allelopathy ; autotoxicity ; citrus replant problem ; plant residues ; sour orange
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The role of allelopathy in citrus replant problems was investigated in Iraq. The failure of citrus seedlings to grow normally in old citrus orchards was not caused by differences between old and non-citrus soils in electrical conductivity, pH, organic matter, soil texture and those minerals tested. Extracts of soil collected from old citrus orchards significantly reduced the growth of sour orange seedlings. Extracts and decaying sour orange roots reduced the growth of sour orange seedlings as did extracts of non-senescent sour orange leaves and decaying senescent leaves. Thus it appears that allelopathy is at least partly involved in the citrus replant problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02214542
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